Re: [Qemu-devel] [PATCH 1/4] vmdk: check for negative sector nums also

[Stefan Weil <weil@mail.berlios.de>]

Eduardo Habkost schrieb:
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  block-vmdk.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/block-vmdk.c b/block-vmdk.c
> index 71d7504..416fb95 100644
> --- a/block-vmdk.c
> +++ b/block-vmdk.c
> @@ -649,7 +649,7 @@ static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
>   

Why is sector_num signed? An unsigned quantity would simplify the code below
(no need to check for < 0).

>      uint64_t cluster_offset;
>      static int cid_update = 0;
>  
> -    if (sector_num > bs->total_sectors) {
> +    if (sector_num < 0 || sector_num > bs->total_sectors) {
>          fprintf(stderr,
>                  "(VMDK) Wrong offset: sector_num=0x%" PRIx64
>                  " total_sectors=0x%" PRIx64 "\n",
>   

Regards
Stefan Weil